austere

adjectives

severely simple
"a stark interior"
austere, severe, stark, stern
is derived from
austereness
of a stern or strict bearing or demeanor; forbidding in aspect
"an austere expression"; "a stern face"
austere, stern
is derived from
austereness
practicing great self-denial
"Be systematically ascetic...do...something for no other reason than that you would rather not do it"- William James; "a desert nomad's austere life"; "a spartan diet"; "a spartan existence"
ascetic, ascetical, austere, spartan
is derived from
austerity